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    Using the isotope dating of endocontact hybrid rocks for the age determination of mafic rocks (southern Siberian craton)

    Access Status
    Fulltext not available
    Authors
    Gladkochub, D.
    Donskaya, T.
    Wingate, M.
    Mazukabzov, A.
    Pisarevskiy, Sergei
    Kornilova, T.
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Gladkochub, D. and Donskaya, T. and Wingate, M. and Mazukabzov, A. and Pisarevskiy, S. and Kornilova, T. 2013. Using the isotope dating of endocontact hybrid rocks for the age determination of mafic rocks (southern Siberian craton). Russian Geology and Geophysics. 54 (11): pp. 1340-1351.
    Source Title
    Russian Geology and Geophysics
    DOI
    10.1016/j.rgg.2013.10.001
    ISSN
    1068-7971
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/53748
    Collection
    • Curtin Research Publications
    Abstract

    Geological observations and petrological and geochemical criteria are used to detect hybrid rocks at the endocontact of a dolerite dike. The hybrid rocks were produced when the material of a mafic intrusion mixed with a felsic melt. The latter was produced by the melting of the metamorphic rocks making up the Goloustnaya basement inlier of the Siberian craton, under the thermal effect of the intruded dike. Two age groups of zircon have been identified in the hybrid rock by SHRIMP analysis. The Paleoproterozoic age of inherited zircon (1902, 1864, 1859, and 1855 Ma) reflects the contribution of ancient sources to the hybrid-rock composition. The young, primary-magmatic, zircon grains, produced by melting at the endocontact of the mafic intrusion (494 ± 5 Ma), are coeval with the hybrid rocks, and their age indicates when the mafic rocks intruded the metamorphic framework. Dikes of close age, with similar geochemical characteristics, are present on the vast southern margin of the Siberian craton-from Goloustnaya to Biryusa salients. © 2013.

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